USB cables based on the FTDI chipset do work with JP2 remotes. Generally, ones based on Prolific chipsets don't.

Let's check which kind of remote you have. Use the 983 Command to blink back the signature of the remote. If the signature is 3039, it is JP1.3. If it is 25562, the remote is a JP2. In either case I recommend cables based on FTDI.

Questions:
I downloaded the Tommy Tyler document, and the title makes reference to "JP1.2/3", not JP2?

So, does that matter? As to the cable source, do I need to use the one you provided, not sourced from Mouser, which is referenced in the Tommy Tyler document? I ask, cause that ebay link seems to source from China, which could take quite some time for delivery. I don't mind paying a few extra bucks if I can source in the US, and get much faster delivery.

Yes, Tommy's instructions work with JP1.4 and JP2 remotes (JP3 also). At the time he wrote the original version, we had no released software support for JP1.4/2/3 remotes.

Getting the part from Mouser (or Digikey) is fine. The part from China is said to include LEDs that light up when TC or RX is signaled, which can be useful at times. But lots of people are using cables without LED indicators.